While you are in Bhutan, we recommend you to add few local or unique activities which can add aesthetic or adventurous flavor in your Bhutan trip.
You can try something Bhutanese; cook Bhutanese dishes, hit the bull eye with traditional bow and arrow, take a Bhutanese hot stone bath; savor the locally brewed alcohol (Ara). Heal yourself by plunging in the medicinal hot spring or go in search of rare flower and birds.
You can take take photograph with monks at the hilltop or learn a meditation technique from Authentic Buddhist master.
.Here is few lists of things which you can add in your itinerary while you are here.